Clutch.



C. F. SCHNUCK.

CLUTCH.

' APPLICATIGNVHLED SEPT. 15. I914. I

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C. F. SCHNUCK.

CLUTCH. APPLICATION FILED SEPT. 15. I914- 1,%Q8',842. I Patelitd Dec. 19,1916.

PSI-IEETS-SHEET 2- WITNESSES:

C. F. SCHNUCK.

CLUTCH. APPLIQATION FILED SEPT. 15. 1914.

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62 %ISM mmmw Patented Dec. 19, 1916.

C. F. SCHNUCK.

CLUTCH. Armcmou man sands. I914,

mam/811 Dec. 19,1916.

4 "SHEETSSHEET f7)- 'WIITNESSES:

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CARL r. sciHNUcK, or ANSONIA, CONNECTICUT, assrenon TO FARREL rou'nnmz &

MACHINE COMPANY, OF ANSONIA, HEO'IICUT.

CONNECTICUT, A. CORPORATION OF CON- CLUTCH.

Specification of Letters Patent. Patented D36, 1L9, 19116,

Application filed September 15,1914. Serial No. 861,825.

To all whom it maynoncern:

Be it known that I, CARL F. SoHNUoK, a citizen of the United States, residing in Ansonia, county of New Haven, and State-of Connecticut, have invented certain new and useful Improvements in Clutches, of which the following is a full, clear, and exact description.

This invention relates to clutches, and more particularly to so-called coil clutches such as commonly used for connecting electric and other'prime movers to heavy machinery, such as rubber mills, rolling mills, crushing and stamping machinery, and the like. In the operation of clutches of this type, the driving part and the driven part are adapted to be coupled together by means of a steel coil which is tightened and released relative to one of said parts by means of actuating mechanism of appropriate construction.

Heretofore it has been common practice for the attendant to tighten and release the coil by turning a hand wheel, or manipulating a similar operating element appropriately connected with the tail of the coil in such a manner as to achieve the intended result. This method of operation requires the expenditure of considerable energy on the part of the operator, and is necessarily slow and inconvenient, especially when the clutch One of the primary objects of the present invention is to provide a coil clutch ofthe general type indicated, having nieans for actuating the coil by power in a very simple and eflicient manner to cause the coupling together of the driving and driven members.

Other objects of the invention are to provide an electromagnetically, operated 'coil clutch which is very simple and compact in construction, and reliable and efficient in o eration; to furnish a device of the type in icated, wherein the electromagnetic controlling or operating means may be used to advantage-even when the clutch is of very massive construction, as where several thousands of horsepower are to be transmitted from the driving member to the driven member;

is a side elevation,

consists of the novel features and combinations of claimed.

In the accompanying drawings,

parts to be hereinafter described and Figure 1 partly in section, of a clutch embodying my improvements; Fig. 2 is a central longitudinal section of the entire clutch shown in Fig. 1, showing it in the off or disengaged position; Fig. 2* is a detail section on line 2*2 of Fig. 2; Fig. 3 is a fragmentary view of certain parts shown in Fig. 2, with the clutch in the on or engaged position; Fig. 4 is an end elevation of the clutch detached from the gear wheel or pulley; Fig. 5 is a central longitudinal section of a further form of clutch embodying my improvements, showing the parts in the engaged position; and Fig. 6 is an enlarged detail of Fig. 5, with the parts in the disengaged or ofi' position.

Referring to the drawings, and more particularly to Figs. 1-4 inclusive, I have shown my improvements applied to a clutch for coupling a continuously rotating gear wheel or pulley 20, to a driven shaft 21, but this is not an essential feature. I have also shown my improvements as applied to a clutch wherein the continuously rotating member, such as the gear wheel or pulley 20,

carries the friction coil 22, which rotates therewith, and is adapted to be brought into frictional contact with a drum or chill 23 'Ifixed to the driven member 21, but this is likewise not an essential feature in most aspects of my invention because, of course, an obvious reversal of the several. parts would be within the scope of my invention. In the form shown in Figs. 14 inclusive, the drum or chill 23 is fixed non-rotatively to the driven shaft 21 by meansof a key or feather 24. Surrounding the drum or chill and bearing thereon, is a driving plate 25 to which one end of the coil 22 is fixed. The coil 22 is so arranged as to surround that portion of the drum or chill which is not surrounded by the driving plate 25, as shown in Fig. 2. The driving plate 25 is fixed to the gear or pulley 20, by means of a. key or feather26, so that as the gear 20 1s rotated it carries the driving plate 25"with 1t, and said driving plate, in turn, carries the coil. When the parts are in the disengaged positiom the coil. moves about a. portion of the drum or chill 23 with a certaln amount of clearance, as shown in Fig. 2. That part of the friction coil 22 which is connected to the' "d riving plate 25 is called the head of the coil, and this co-callled head, which is indicated at 27 (Fig. 4) is interlocked with the driving plate in any appropriate manner. By preference, the head of the coil carries a lug which fits into a notch of the driving plate, but as this means of connection is well known in the art, I have not considered it necessary to illustrate it in detail. The tail of the coil is shown at 28, andthe coil is engaged with the drum by shifting the tail in such a direction relative to the body of the coil as to wind up the coil to a certain extent, and thereby cause it to bind against the smooth outer surface of the drum. By winding up the coil, it is tightly clamped on the drum or latter partakes of the rotation of the coil, and the drum or chill in turn rotates the driven shaft 21 to which it is fixed. In the particular form shown, the pulley, driving plate, and coil rotate in the direction of the arrow (Fig. l) and the coil is wound in the opposite direction from the head to the tail, as shown in Fig. 4. In other words, in the example shown, the direction of rotation of the driving plate is clockwise, and the direction of wind of the coil, from the head to the tail, is counter-clockwise. By preference, the coil 22 diminishes in cross sectional area from the head to the tail, so that when the tail is suitably manipulated to wind the coil, the latter will grip the drum in a gradual manner, and thus cause the gradual engagement of the clutch so as to dispense with all shock or jarring,

The clutch coil is adapted to be wound by power transmitted directly to the tail. In the form shown, in which the coil rotates around the driven part, the engagement of the coil is effected by temporarily fixing the tail of the coil to the driven part when the latter is stationary, and thereby causing the tail to lag behind the main part of the coil. Holding back the tail, by connecting it with the stationary, or slower moving driven part, winds up the rotating coil until it frictionally engages the drum, or other driven memher, and thereby couples the driven member to the driving member.

In the example shown, the clutch coil is tightened by means of an auxiliary clutch which looks the tail of the coil to the driven part. In a reversal of the arrangement shown, the auxiliary clutch would, of course, lock the tail of the coil to the driving part,

chill, so that the the head of the coil being permanently con- 'nected'in that case with the driven part.

In the embodiment illustrated in Figs. 1-4, this auxiliary clutch is constructed as follows: The tail 28 of the coil (Figs. 2 and 2) is suitably interlocked with a plate 29, for instance by the coil extend into a notch 31 in said plate 29. The tail plate 29 is adapted to turn, or move angularly, in a rabbet 32 ofa casing member 33. The member 33 is suitably secured to the driving plate 25, (for example, by the screws 34, shown in Fig. 4:) and incloses a part of the clutch coil. The plate 29 serves as a cover or end plate for the open end of the casingmember of shell 33 and forms a part of the casing. It also serves as one part of the auxiliary clutch, to which end it 1s provided on its inner face with a conical or beveled surface 35, adapted to cooperate with a conical or beveled surface 36 on the other member 37 of the auxiliary clutch. The members 29, 37, therefore form in conjunction a cone clutch having the cooperating friction surfaces 35, 36 respectively. In the embodiment now being described, the part 37 of the clutch is the movable part, being adapted to be shifted into and out of engagement with the part 29. The part 29 is substantially immovable in an axial direction, but, as before stated, said part 29 is capable of turnin movement in the bearing of the shell 33, For the purpose hereinafter stated. In the formshown,

the part 29 has the female clutch surface,

and the part 37 has the male clutch surface, but obviously this arrangement can be reversed, if desired. The part 37 is in the form of a cup, or shell, and it is non-rotatively connected with the drum 23 by means of a key or feather 38. However, this key or feather 38 is so arranged as to permit lengthwise movement of the member 37 relative to the drum or chill, andto the clutch member 29. Fixed within the head of the cup shaped member 37 is a core or plug 39. Both the clutch member 37 and the core 39 are made of soft form the armature of an electromagnet in the form of solenoid. Located within the cup-shaped member 37 is another cup shaped member 40 of dynamo steel, having an an-- nular shoulder 41, bearing on a shoulder 42 on the interior surface of the plate 29. The member 40 is slidable in an endwise direction on the shoulder 42 and relative to the member 37. The member 40 is a solenoid member to cooperate with the armature member 37 and has fixed therein a solenoid coil 44. Fixed within the head portion of the member 40 is a solenoid plug or core 43 similar to the core or plug 39. The coil 44 surrounds the plugs 39 and 43, and is fixed relative to the plug 43, but movable relative to the plug 39 when the member 40 is moved having a lug 30 on the tail of dynamo steel, and they.

eoaeae toward the member 37. In other words, the members 37 and 40, which telescope each 1 other, are slidable relative to each other, and

each has fixed thereto a solenoid core, while one of the members, such as 40, carries a solenoid coil, which is fixed relative to one core and surrounds both cores. The head of the member 40 has fixed thereto a rod 45, which extends freely through an opening in the plate 29 and is surrounded by a spring 46. The spring 46 is interposed between the outer surface of the plate or head 29 and a collar 47, which is adjustably held on the y outer end portion of the rod 45 by nuts 47,

48. The spring 46 normally holds the cup or shell 40 in the position shown in Fig. 2, I

wherein the head portion thereof is in abutment with the inner surface of the plate 29.-

L WVhen the'partsare in this position, there 20 is a gap 49 between the solenoid cores, and

a gap 50 between the head of the member 37 and the rim of the member 40. The solenoid coil 44 is connected to leads 51, 52 respectively, which pass out of the casing through bushings 53 in the plate 29. These bushings also serve as guides for the member 40, but said member 40 is additionally guided in its sliding movement by the pin 54 (Fig. 4). The leads 51, 52 pass through a conduit 55, which is bored through the easing 33, and the driving plate 25. At the opposite side of the rotary drivingplate 25,

these leads 51, 52 respectively are connected to the slip rings 56, 57 respectively, which are suitably insulated from each other. A

fixed brush 58 bearing against thering 56 is connected to one ole of a generator G,

or other source of e ectric current, while a similar brush 59, bearing on the ring 57, is connected to the other pole of said generator. A switch 60 interposed in the circuit enables the latter to be closed or opened as desired, for the purpose of putting the sole noid coil 44 into. or out-of communication with the generator, or 'other source of current. When the switch 60 has beenclosed,

electrical connection between the; solenoid coil 44 and the generator G is maintained,

irrespectiveof' the rotation" of the solenoid coil, by reason of the permanent contact of the brushes 58, 59 with the slip rings56, 57 respectively. 7 I The wires and other parts are, of course, suitably insulated so that-there will be no short circuiting. a

If desired, suitable springs may be used.

' for regulating the angular movement of the clutch member 29 relative to the casingl33.

In the form shown, two springs 61 are employed for this pUrposefiEach of these springs is connected at one end with the plate 29, as shown at 62, and at the opposite end with the casing member 33, as shown at 63.

The operation of the clutch is substantially as follows: When the parts are in the position shown in Figs. 1 and 2, with the switch 60 in the off position, the rotation of the pulley or wheel 20, has no effect upon. the driven parts 23, 21, owing to the fact I that the clutch coil surrounds the drum 23 with a certain amount of clearance, as shown in Fig. 2. The parts of the auxiliary clutch have the position shown in Fig. 2. When it is desired to drive the shaft 21, the switch 60 1s closed so as to place the solenoid coil 44 in electrical communication with the generator G. This energizes the solenoid coil,

and therefore the armature comprising the member 37 and core 39 is at once attracted toward the solenoid member 40 and its core 43. As a result, the armature 37 moves to I the right, with reference to Fig. 2, causing the clutch surface 36 on said armature to engage the coiiperating clutch surface 35 of the tail plate. The normal clearance between these clutch surfaces 35, 36 is somewhat less than the clearances 49 and 50, so that when said surfaces 35, 36 are brought into contact with each other, there is, mo-

mentarily, a gap between the plug or core and the plug or core 43, also between the rim, of the member 40 and the head portion of the member 37. The member 37 being then blocked against further movement toward the right, with reference to Fig. 2, and the magnetic attraction between the parts 37 and 40 respectively, and the cores 39 and 43 respectively being continued and i u nsatisfied, the magnetic impulse of the strong field causes the solenoid member 40 to move to the .left with reference to F ig. 2, until the plug 43 freezes to the plug 39, at which instant the rim of the member 40 will freeze,t the head ofth'e member 37. This connects the respective members 37 and 40 by a very powerful union, making them act, in effect, as asingle member, and putting the spring 46 under a very powerful compression, as the member 40 moves to the left with, reference to its normal position (see Figs. 2 and 3). The spring 46 1 thus acts with full force on the member 37,

through the member 40, pulling said member 3 to thewright with reference to Fig.

2, into extremelytight engagement with the plate 29. The clutch surfaces 35, 36 of the auxiliary clutch are thus held together powerfully as long as the circuit is closed.

inasmuch s the plate 29 isrotating with the tail of the clutchcoil 22, at the com.-

- mencement of the operation, and the part 37 (connected with the drum 23) is stationary, or is moving slower than the coil, the

engagement of the surface 36 with the surface 35 causes the rotation of the plate 29 to be instantly retarded. Therefore, the tail of the clutch coil is dragged back or retarded relative to the main part of the coil, and as a result the coil is wound up or tightened to a certain extent, so as to bring its convolutions into full contact with the drum 23. Hence, the rotation of the driving plate is at once transmitted to the drum 23, and to the driven shaft 21.

Upon opening the circuit by means of the switch 60, the magnetic lines of force are immediately broken, and the spring 46 acts at once to break the contact of the cores 39 and 43 and the members 37 and 40. The coil-carrying member 40, and its core 43, are moved back to the right, as shown in Fig. 2, by means of this spring 46, which acts immediately upon the breaking of the circuit to strip the member 40 and its core from the cooperating member and core. The member 37 being thus freed from the member 40, there is nothing to hold it in ngagement with the plate 29, and the cone surface 36 is immediately thrown out of.

contact with the cone surface 35, thus freeing the tail plate or member 29 from the driven member. Therefore, the tail of the coil is free to resume its initial position relative to themain part of the coil, and the convolutions of the coil immediately spring clear of and release the drum 23, permitting the drum and driven shaft to come to a stop, while the rotation of the driving part is continued.

When the clutch is engaged, the rotation of the plate 29 is arrested to a certain extent, thus moving said plate counter-clock wise relative to the casing 33, through a certain distance. This lengthens out the springs Gland puts them under tension. \Vhen the circuit is broken, the springs 61 are permitted to act, and they expedite the return of the plate 29 and the tail of the coil to their initial position relative to the casing. These springs hasten the disengagement of the clutch coil from the drum to a certain extent, but in many cases such' springs are unnecessary, because the spring in the metal of the clutch coil causes "the latter to assume its released or off position almost immediately'upon the release of the tail plate fromthe driven member.

Figs. 5 and 6 show a modified form of the clutch, in which what might be termed an annular electromagnefiis employed in lieu of a solenoid. In this example the.drum 88 has secured to the end thereof a plain disk or plate 89 of soft dynamo steel, which forms the end plate of the casing. The clutch coil 90 is fixed to a driving plate 91 keyed to the wheel or pulley 92, and rotates about the drum, as before. A casing member 93 attached to the driving plate 91 extends int'o substantial contact with the plate 89. A ring 94 is guided on the casing member 93 by being mounted on the outer. surface of said casing, said ring being capable of axial movement as well as turning movement. This ring 94 is interlocked with the tail of the coil by means such as a lug 95 (Fig. 6) which extends through a clearance opening 96 in the easing into engagement with an out-turned lug on the coil. The ring carries an annular magnet coil 97, which is preferably fitted in an annular groove in said ring, and the ring has friction surfaces on opposite sides of the groove to cooperate with opposing portions of the plate 89. The magnet coil is connected with a source of electric current G by means substantially similar to those described in connection with Figs. 1 to 4. A spring or springs 100 tend to hold the ring or tail plate 94 away from the cooperating plate 89, and a spring or springs 101 connect the tail plate with the casing in such a manner as to hold said parts normally in a definite angular relation. When the circuit is closed the tail plate 94 is moved axially into contact with the cooperating portion of the fixed armature plate 89 in an obvious manner. This arrests the tail plate and drags back the tail of the clutch coil 90, causing said clutch coil to be tightened on the driven part in substantially the same manner hereinbefore described. iVhen the magnet coil 97 is deenergized the spring or springs 100 strip the tail plate from the plate 89 so as to release the clutch, and the return of the tail to he initial released position is expedited by the spring or springs 101. The spring or springs 100 correspond in function to the spring 46, described in connection with Figs. 1 to 4, and the spring or springs 101 correspond in function to the springs 61, previously described.

It will be obvious that the plate 89 serves as a fixed armature, Which is secured to or forms a part'of the driven member, while the ring 94 provides a magnet field movable axially of the armature into andout of cooperation therewith, the movable part of the magnet structure-being connected with the clutch coil. In the form shown in Figs. 1 to 4 the armature is movable in an axial direction, but in that case also a magnet member non-rotatively connected with the clutch coil is movable axially toward and away from the armature. Moreover, in both cases the end plate forms a part of the magnet structure and acts as a support for one of the main magnet members. In both cases also the drum serves as a mounting or support for one of the main magnet members, while one of the parts forming the clutch-coil casing serves as a support or mounting for the other. Furthermore, in both cases, the drum serves as a mounting for the armature member, while the tail plate serves as a mounting for the magnet coil.

It will be seen from the foregoing description that by my invention, I provide a coil clutch which may be very readily controlled with the expenditure of a negligible amount of energy on the part of the attendant. The clutch may be engaged by the manipulation of means such as a common form of electric switch. By closing the switch, the clutch is engaged immediately, and by opening the switch the clutch is disengaged immediately. Furthermore, it is important to note that the clutch may be operated very economically. The primary fact-or in the operation of the clutch is the enormous friction developed by the convolutions of the clutch coil, and the electromagnetically operated mechanism is a controlling mechanism rather than a main operating mechanism. The amount of electric power used in manipulating the tail of the clutch coil by means of the auxiliary clutch is very slight in comparison to the frictional grip developed by the clutch coil, and even 111 the case of machinery of the heaviest type, where several thousands of horse power are to be transmitted, the consumption of electric energy is relatively small, and the clutch can be maintained at slight expense. It will be noted, moreover, that the electromagnetic controlling means for the clutch coil is self-contained, for the most part, that is to say, it is carried by the clutch proper as a permanent part thereof.

In so far as I am aware, an electromagnetically operated controlling means has never been successfully incorporated in a clutch of the friction coil type, and hence I desire to have my claims in this regard accorded a broad interpretation. Of course, the type of clutch coil or band, and the type of the controlling mechanism therefor, may be widely varied.

While I have illustrated and described two -:embodimcnts of my inventive idea, I have notatte'mpted to illustrate and describe all of the various forms which the invention. may take, and it will be obvious that many various changes in the construction above described may be adopted scope of my invention, as expressed in the claims.

What I claim is;

1. In a coil clutch, the combination of an annular driving member, a cylindrical driven member embraced there-b a helical friction coil attached at one end to said driving 1 member and surroimding said driven memher alongside said driving member, a cylin drical shell inclosing said coil and carried by sald annular driving member, and a mag net structure for locking the free end of,

said coil to said driven member, including an end plate for said shell; substantially as described. l

2. In a coil clutch, the combination-of a driving member, a driven member, one of said members comprising a drum, a friction coil attached to the other member and embracing said drum, an auxiliary clutch within the iliary clutch, and electromagnetic means interpomd between said auxiliary clutch members for moving the same into engagement with each other; substantially as described.

4. In a coil clutch, the combination of two clutch members, one of said members formed as a cylinder, a helical friction coil embracing said cylinder and attached at one end to the other clutch member, the free end of said coil located adjacent one end of said cylinder, and an electromagnetic auxiliary clutch interposed between the-said end of said cylinder and the free end of the coil; substantially as described.

5. In a coil clutch, the combination of two main clutch members, one of said members comprising a drum, a friction ooil attached to the other member and embracing said drum, a tail plate attached to the free end of the friction coil, and electromagnetic means carried by the tail plate for clamping the same to the drum; substantially as described.

6. In a coil clutch, the combination of two main clutch members, one of said members comprising a drum, a friction coil attached to the other member and embracing said drum, a plate connected with the free end of the friction member of an auxiliary clutch, a part nonrotatively connected with said drum and constituting the other member of said auniliary clutch, and electromagnetic means can ried by the plate connected with the free end of the coil for interengaging the members at the auxiliary clutch; substantially as'described. I

7. In a coil clutch, the combination of a driving member, a driven member, one of said members comprising a drum, a ftriction coil and constituting one aur- I I if:

free end oit'the friction coil, an electromagy not carried by the tail plate, and an armature for said eleotromagnet carried by the drum; substantially as described.

8. In a coil clutch, the combination oit a driving member, a driven member embraced thereby and comprising a drum or sleeve, a friction coil having its head secured to said driving member,

said coil adapted to be tightened on said driven member, a plate connected with the free end or tail of the friction coil, an electromagnet carried by said plate, and an armature for said electromagnet non-rotatively secured to the end portion of the drum; substantially as described.

9. In a coil clutch, the combinatiomof a driving member, a driven member, one of said members comprising a drum, a fricdriving member, a driven member, one of sald members comprislng a drum, a frictioncoil attached to the other member and embracing said drum, a casing comprising a shell inclosing said friction coil and a separate end plate for'said shell, and a, magnet structure for locking the free end of the friction coil to said drum, including said end plate as a part thereof; substantially as described. f i

11. In a coil clutch, the combination of two main clutch members,"one of said members comprising a drum, a friction coil. em-

' drum, a helical friction coil surrounding the same and adapted to dgrip said drum when a drivingv member bracing said drum and adapted to be tightened thereon, said friction coil having a head attached to the otherclutch. member, a casing for the friction coil, and amagnet structure for clamping the free end of the friction coil to the drum, said magnet struc-' ture including a member carried by the easing and a coiiperating member carried by' the drum; substantially as described.

12. In a coil clutch, the combination of driving and driven members, one-of said members being in the form of a cylinder or drum, and the other member embracing said cylinder or drum, a friction coil surroundtill ing a portion of said cylinder or drum along side said outer member and secured at its head to said outer member, a plate connected with the free end of the friction coil and constituting one member of anauxiliary' inner and outer clutch members, the outer, member rotatable on the inner member, a friction coil secured to the outer member and extending laterally therefrom and surround ing a. portion of the inner member, said coil adapted to be tightened on said inner member to lock the latter to the outer member,

an inclosing casing for the friction coil comprising a shell carried by the outer member and a separate end plate for the shell, and

means for locking the free end of the friction coil to the drum to Wind said coil; substantially as described.

1 1. In a coil clutch, the combination of an inner member in the form of a cylinder or drum, an outer member and a friction coil located side by side around said drum, said friction coil connected at one end to said outer member, a shell inclosing the friction coil, secured at one end to the outer member, an end plate closing the end of the shell and extending across the end of. the drum so as to inclose the drum, and means for locking the free end of the coil. to'thej. drum so as to tighten the coil thereon; stantially as described.

15. In a coil clutch, the combination of driving and driven members, one of said members com rising a drum, a friction coil surrounding t e drum and connected at one end to the other member, a casing member inclosing said friction coil, a tail plate consu r nected with the free end or'tail of the coil and engaging. said casing'member, for turning movement with respect to the latter, and

electromagnetic means for causing angular movement of the tail plateto Wind the coil on the drum; substantially as described,

- 16. In a coil clutch, the combination of a coil, is tightens I securedto one end of said friction coil, a

member fixed against independent rotation relatively to one end of said drum, amem- 'ber adjacent said first member adapted to turnQwith the free end or tail of the coil, and a magnet for frictionally engaging said members; substantially as describe 17. In a coil clutch, the combination of.

driving and driven-members, "one of; said members comprisinga drum, a. friction coil surrounding the drumand having amthiok 1 head portion and a thin tail portion, means for securin the head. portion of the coil to the other c utch member, a tail plate engag ing the tailportionofthe coil, a-casing mem her guiding said tailplate for turning move ment, and an electrbmagnet for locking the tailiplate to the drum having a magnet coil and an armature, one of said last-named parts carried by the drum, and the otherpart carried by the tail plate; substantially as described.

'18 In a coilpclut ch, the combination of ClIlYlIlg and dr ven members, one of said members comprislng' a drum, :1 frictlon coll surrounding the drum and having a thick mosses tail plate and the other part carried by the drum; substantially as described.

' l9."ln a coil clutch, the combination of driving and driven members, one of said members comprising a drum, a friction coil having a thick head portion attached to the other clutch member and a free tail portion of less cross-sectional area than said head portion, said coil embracing said drum, a casmg member carried by and rotatable with the second-named clutch member, a second casing member closing one end of the first casing member and extending across the end of Scribed. r l a a j 20. In a coil clutch, the comb nation of I driving and driven members, a friction 0011 the drum, and an electromagnet for locking the tail portion of the coil to. the drum, hav- -ing a magnet and an armature, one of said last-named parts being carried by the drum.

. and the other art being connected with the tail portion 0 the coil; substantially as,de-

connected with one of said members and surrounding the other member, a plate connected with the free endot the friction coil,

the coil, and means for ack to its initial posi tion when the clutch arts are disengaged; substantially as describ ed. 21. In a coil clutch, the combinationof driving and driven members,- one of, said turning said plate members comprisingja. drum, a friction coil surrounding said drum and secured at one magnet,

r stantially' as describedzi' end to the other clutch member, a tail late connected with the free end or tail '0 the coil, an electromagnet for locking the tail 'plate to the drum, having a magnet coil and an armature, one of said last-named parts carried by the drum, and the other of said last-named parts carried by the tail plate,-means for energizing said electro- I v and means acting on the tail plate" for giving the same an unwinding movement when the electromagnet is-denergized; sub- 22.. In acoil clutch, thecombination of surrounding said drum and secured to the other member, a casing for the coil, and an electromagnet for locking the free end of the coil to the drum comprising relatively movable armature and magnet-coil-carrying members, one of said last-named members carried by the drum, and the other of said last-named members, being carried by the casing; substantially as described. Y

23. In a coil clutch, the combination'of two main clutch members, a friction coil connected with one of said members and adapted to be tightened on the other, a casing for the friction coil, and a. magnet structure for clamping the free end of the friction coil to the other said clutch member,

said magnet structure including a member carried by the casing and a cooperating mem ber carried by said last-named clutch member; substantially as described.

24:. In a coil clutch, the combination of two main clutch members, one of said members comprising a drum, a friction coil connected with the other member and embracing said drum, a casing for the clutch comprising a member inclosing the friction coil and an independently rotatable member extending across the end of the drum, and a two-part magnet structure for clamping the free end of the friction coil to the drum, havin one of its parts carried by the drum and t e cooperating part carried by one of said, casing members; substantially as de: scribedi 25. In a coil clutch; the combination of two main clutch members, one of said members comprising adrum, a friction coil connected With the other member and embracing saiddi'um, a two-part casing for the clutch comprising a part inclosing the friction coil and an independently rotatable part extending across the end 'free end of the friction coil to the drum, in-

cooperating member operatively connected with the free end of said friction coil; sub

'stantially as described. y l

26. In acoil clutch, the'combination of two mainclutch members, one of said'members comprising a drum, a friction coil attached to the other member and embracing said drum, a two-part casing for the clutch comprising independently rotatable parts, and a ma et structure forclamping the free endo the friction coil to the drum, in eluding an armature member and a magnetcoil-carryin member, one of said last named mem ers bein carried by the drum,

and the other of sai last named members .being mounted on one of the casing memhers and operatively connected with the free end of the friction coil; substantially as de scribed.

driving members being in the form of drum, and the other member embracing said cylinder or drum, a friction ing a portion of said 1) linder or drum alongside said outer me'mli shell for the friction coil rotatable with the outer clutch member, an end plate for said shell, an auxiliary clutch member carried by the drum a auxiliary clutch member connected with the free end of the friction coil, and means for interengaging the auxiliary clutch members; substantially as described.

28. In a coil clutch, the combination of 'driving and driven members, one of said of the drum, and a magnet structure for clamping the l I 27. In a coil clutch, the dombination of and driven members, one of said a cylinder or er, an inclosing carried. by and cotiperating its coil surroundmembers comprising a. drum, a friction coil connected. at one end with the other member and i; timid. i l friction coil having a lug at its e end or tail, a tail plate engaging the lug at the tail of the i c said tail plate coil, :1 c member {mi ing for locka, .no ing the tail plate to the drum to Wind the coil; substantially as described.

9 9. To a coil clutch. the combination of drii'ii and driven members, one of said members comprising a drum, a friction coil snrroundino said drum and connected at one end to the on member, a casing member carried by and rotatable with such other member, and means including a plate connected with the tail of the coil for Winding the coil on said drum, said Winding plate also serving as an end plate for the casing;

substantially as described.

30. in a coil chitch, the combination of driving and driven members, one of said members comprising a drum, a friction coil surrounding said drum andconnected at one end with the other member, ibtail late connected with the free end or 'tfill; 0lf the coil, a magnet coil carried by said tailgolate, and an armature member for said solenoid noni ,aoeeee rotatively engaged with the drum; substantially as described,

81, in a coil clutch, the combina'ion oi driving and driven members, a friction coil connected With one of said members and adapted to be wound. on the other member, a tail plate connected with the free end of the friction coil, a sliding solenoid member mounted on said tail plate, and a sliding armature member carried by the said other clutch members and cooperating with said solenoid member; substantially as described.

32. In a coil clutch, the combination of driving and driven members, one of said members comprising a drum, a friction coil surrounding said drum and connected at one end with the other member, a casing or shell carried by such other member. an end plate for said casing or shell serving as a tail plate for the coil, and an electroniagnet for locking the tail plate to the drum; substan tially as described.

In Witness whereof, I have hereunto set my hand on the 12th day of September, 191%.

I CARL F. SGHWUCK.

Witnesses:

' HENRY E. RooKwELL, M. OLIVE WITLIAMS. 

